1. Impact on pipeline connection performance

In terms of welding connections, steel pipes need to be connected by welding in applications such as oil and gas pipelines and water supply and drainage pipelines. If the length accuracy of LSAW Steel Pipes is insufficient, such as being too long, it may cause the weld gap to be too small or even impossible to connect during pipeline docking, requiring on-site cutting correction. This not only increases construction difficulty and cost, but may also affect the quality of the weld. On the contrary, if the length of the steel pipe is too short, the gap between the welds will be too large, requiring more welding materials to be filled, which may lead to concentration of welding stress and reduce the strength and sealing of the welds.

In terms of mechanical connections: In some application scenarios such as building structures, when using mechanical connection methods (such as flange connections), insufficient length accuracy can lead to the inability of connecting components to fit tightly together. For example, excessive length deviation may cause bolt holes between flanges to be misaligned, affecting the tightness of the connection and the stability of the structure.

2. Impact on pipeline installation efficiency

In terms of construction progress, high precision steel pipe length can greatly improve installation speed in long-distance oil and gas pipeline laying projects. The precise length makes the alignment and assembly operations during pipeline laying more convenient and efficient, reducing on-site adjustment time. If the length accuracy is poor, it will take time to measure and adjust the length of the steel pipe every time it is installed, which will seriously slow down the construction progress. For example, in large-scale pipeline projects, a certain number of steel pipes are planned to be laid every day, and low length accuracy may lead to a reduction in the number of pipes laid, thereby affecting the overall project schedule.

In terms of construction costs: Poor length accuracy will increase additional construction costs. On the one hand, cutting or repairing steel pipes on site to adapt to the correct length requires manpower, material resources, and time; On the other hand, the low installation efficiency caused by inaccurate length will increase costs such as equipment rental time and labor hours. For example, in the construction of urban water supply and drainage pipelines, if the length of the steel pipe is inaccurate, frequent on-site adjustments will increase the stay time of construction equipment on site and increase rental costs.

3. Impact on pipeline system performance

In terms of fluid transport performance: In fluid transport pipelines, the accuracy of steel pipe length affects the overall straightness and sealing of the pipeline. If the length accuracy is insufficient, local bending or deformation may occur after pipeline connection, affecting the smooth flow of fluid, increasing fluid resistance and energy loss. For oil and gas transmission pipelines, it may also cause local pressure changes, affecting transmission efficiency.

In terms of structural load-bearing performance: In the application of building structures, LSAW steel pipes are used as supporting components, and insufficient length accuracy will affect the load-bearing capacity of the structure. For example, when the length of steel pipes is too long and used in building column structures, it may lead to an increase in the actual bearing length of the columns, reducing their stability and bearing capacity; However, if the length is too short, it may not be able to reach the designed structural height, affecting the mechanical performance of the entire building structure.

Improve the length accuracy of LSAW steel pipes:

1. Optimize cutting process

Adopting high-precision cutting equipment: using advanced equipment such as CNC flame cutting machines, plasma cutting machines, or laser cutting machines. For example, laser cutting machines have high-precision cutting characteristics and can control the cutting length error of steel pipes within ± 1mm. These devices can perform precise cutting according to preset length parameters through precise CNC systems.

Calibrate cutting equipment parameters: Regularly inspect and calibrate cutting equipment. Adjustment of parameters including cutting speed, flame intensity (for flame cutting), plasma gas flow rate (for plasma cutting), etc. For example, in flame cutting, a reasonable cutting speed can ensure the flatness and length accuracy of the incision. If the speed is too fast, it may cause the incision to be uneven, affecting length measurement, while if it is too slow, it will reduce production efficiency.

Post cutting treatment: After cutting is completed, the end of the steel pipe is polished and cleaned to remove burrs and oxide scales generated during the cutting process. Because these impurities may affect the accuracy of subsequent length measurements and may cause loose joints during pipeline connections.

2. Accurate measurement and control technology

Using high-precision measuring tools such as laser rangefinders and electronic calipers to determine the length of steel pipes. Laser rangefinder can achieve non-contact measurement with an accuracy of ± 0.5mm, and can quickly and accurately obtain data in steel pipe length measurement.

Real time monitoring and feedback system: Install a length monitoring system on the production line, which can measure the length of steel pipes in real time and provide data feedback to the control system. Once the length deviation exceeds the set range, the control system can adjust the production process in a timely manner, such as adjusting the cutting position of the cutting equipment or adjusting the conveying speed of the steel pipe.

Data recording and tracing: Record the length measurement data of each steel pipe and establish a database. Through data analysis, the trend of changes in length accuracy can be discovered in order to adjust production process parameters in a timely manner, and detailed length information can also be provided during product quality traceability.

3. Improve the production process

Stable forming process: During the forming process of LSAW steel pipes, forming processes such as JCOE and UOE ensure stable bending and forming of the steel plate. If the forming process is unstable, the steel pipe may experience local deformation, resulting in inaccurate length measurement. For example, in the JCOE forming process, precise control of the force and position of each stamping ensures that the shape of the steel pipe is regular, which is beneficial for subsequent length determination.

Optimize welding process: Thermal deformation during the welding process can affect the length of the steel pipe. Adopting appropriate welding process parameters, such as welding current, voltage, welding speed, etc., to reduce deformation in the welding heat affected zone. For example, using multi-layer and multi pass welding technology can make the heat distribution of welding more uniform and reduce the impact of thermal deformation on the length of steel pipes.

Strict quality control process: Strict quality control points are set up at various stages of steel pipe production, including raw material inspection, forming, welding, testing, etc. Timely rework or scrap steel pipes that do not meet the length accuracy requirements to ensure that the length accuracy of the factory products meets the standards.